gdb/ser-unix.c

   1 /* Serial interface for local (hardwired) serial ports on Un*x like systems
   2
   3    Copyright (C) 1992-2015 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21 #include "serial.h"
  22 #include "ser-base.h"
  23 #include "ser-unix.h"
  24
  25 #include <fcntl.h>
  26 #include <sys/types.h>
  27 #include "terminal.h"
  28 #include <sys/socket.h>
  29 #include <sys/time.h>
  30
  31 #include "gdb_select.h"
  32 #include "gdbcmd.h"
  33 #include "filestuff.h"
  34
  35 #ifdef HAVE_TERMIOS
  36
  37 struct hardwire_ttystate
  38   {
  39     struct termios termios;
  40   };
  41
  42 #ifdef CRTSCTS
  43 /* Boolean to explicitly enable or disable h/w flow control.  */
  44 static int serial_hwflow;
  45 static void
  46 show_serial_hwflow (struct ui_file *file, int from_tty,
  47                     struct cmd_list_element *c, const char *value)
  48 {
  49   fprintf_filtered (file, _("Hardware flow control is %s.\n"), value);
  50 }
  51 #endif
  52
  53 #endif /* termios */
  54
  55 #ifdef HAVE_TERMIO
  56
  57 /* It is believed that all systems which have added job control to SVR3
  58    (e.g. sco) have also added termios.  Even if not, trying to figure out
  59    all the variations (TIOCGPGRP vs. TCGETPGRP, etc.) would be pretty
  60    bewildering.  So we don't attempt it.  */
  61
  62 struct hardwire_ttystate
  63   {
  64     struct termio termio;
  65   };
  66 #endif /* termio */
  67
  68 #ifdef HAVE_SGTTY
  69 struct hardwire_ttystate
  70   {
  71     struct sgttyb sgttyb;
  72     struct tchars tc;
  73     struct ltchars ltc;
  74     /* Line discipline flags.  */
  75     int lmode;
  76   };
  77 #endif /* sgtty */
  78
  79 static int hardwire_open (struct serial *scb, const char *name);
  80 static void hardwire_raw (struct serial *scb);
  81 static int wait_for (struct serial *scb, int timeout);
  82 static int hardwire_readchar (struct serial *scb, int timeout);
  83 static int do_hardwire_readchar (struct serial *scb, int timeout);
  84 static int rate_to_code (int rate);
  85 static int hardwire_setbaudrate (struct serial *scb, int rate);
  86 static int hardwire_setparity (struct serial *scb, int parity);
  87 static void hardwire_close (struct serial *scb);
  88 static int get_tty_state (struct serial *scb,
  89                           struct hardwire_ttystate * state);
  90 static int set_tty_state (struct serial *scb,
  91                           struct hardwire_ttystate * state);
  92 static serial_ttystate hardwire_get_tty_state (struct serial *scb);
  93 static int hardwire_set_tty_state (struct serial *scb, serial_ttystate state);
  94 static int hardwire_noflush_set_tty_state (struct serial *, serial_ttystate,
  95                                            serial_ttystate);
  96 static void hardwire_print_tty_state (struct serial *, serial_ttystate,
  97                                       struct ui_file *);
  98 static int hardwire_drain_output (struct serial *);
  99 static int hardwire_flush_output (struct serial *);
 100 static int hardwire_flush_input (struct serial *);
 101 static int hardwire_send_break (struct serial *);
 102 static int hardwire_setstopbits (struct serial *, int);
 103
 104 void _initialize_ser_hardwire (void);
 105
 106 /* Open up a real live device for serial I/O.  */
 107
 108 static int
 109 hardwire_open (struct serial *scb, const char *name)
 110 {
 111   scb->fd = gdb_open_cloexec (name, O_RDWR, 0);
 112   if (scb->fd < 0)
 113     return -1;
 114
 115   return 0;
 116 }
 117
 118 static int
 119 get_tty_state (struct serial *scb, struct hardwire_ttystate *state)
 120 {
 121 #ifdef HAVE_TERMIOS
 122   if (tcgetattr (scb->fd, &state->termios) < 0)
 123     return -1;
 124
 125   return 0;
 126 #endif
 127
 128 #ifdef HAVE_TERMIO
 129   if (ioctl (scb->fd, TCGETA, &state->termio) < 0)
 130     return -1;
 131   return 0;
 132 #endif
 133
 134 #ifdef HAVE_SGTTY
 135   if (ioctl (scb->fd, TIOCGETP, &state->sgttyb) < 0)
 136     return -1;
 137   if (ioctl (scb->fd, TIOCGETC, &state->tc) < 0)
 138     return -1;
 139   if (ioctl (scb->fd, TIOCGLTC, &state->ltc) < 0)
 140     return -1;
 141   if (ioctl (scb->fd, TIOCLGET, &state->lmode) < 0)
 142     return -1;
 143
 144   return 0;
 145 #endif
 146 }
 147
 148 static int
 149 set_tty_state (struct serial *scb, struct hardwire_ttystate *state)
 150 {
 151 #ifdef HAVE_TERMIOS
 152   if (tcsetattr (scb->fd, TCSANOW, &state->termios) < 0)
 153     return -1;
 154
 155   return 0;
 156 #endif
 157
 158 #ifdef HAVE_TERMIO
 159   if (ioctl (scb->fd, TCSETA, &state->termio) < 0)
 160     return -1;
 161   return 0;
 162 #endif
 163
 164 #ifdef HAVE_SGTTY
 165   if (ioctl (scb->fd, TIOCSETN, &state->sgttyb) < 0)
 166     return -1;
 167   if (ioctl (scb->fd, TIOCSETC, &state->tc) < 0)
 168     return -1;
 169   if (ioctl (scb->fd, TIOCSLTC, &state->ltc) < 0)
 170     return -1;
 171   if (ioctl (scb->fd, TIOCLSET, &state->lmode) < 0)
 172     return -1;
 173
 174   return 0;
 175 #endif
 176 }
 177
 178 static serial_ttystate
 179 hardwire_get_tty_state (struct serial *scb)
 180 {
 181   struct hardwire_ttystate *state;
 182
 183   state = (struct hardwire_ttystate *) xmalloc (sizeof *state);
 184
 185   if (get_tty_state (scb, state))
 186     {
 187       xfree (state);
 188       return NULL;
 189     }
 190
 191   return (serial_ttystate) state;
 192 }
 193
 194 static serial_ttystate
 195 hardwire_copy_tty_state (struct serial *scb, serial_ttystate ttystate)
 196 {
 197   struct hardwire_ttystate *state;
 198
 199   state = (struct hardwire_ttystate *) xmalloc (sizeof *state);
 200   *state = *(struct hardwire_ttystate *) ttystate;
 201
 202   return (serial_ttystate) state;
 203 }
 204
 205 static int
 206 hardwire_set_tty_state (struct serial *scb, serial_ttystate ttystate)
 207 {
 208   struct hardwire_ttystate *state;
 209
 210   state = (struct hardwire_ttystate *) ttystate;
 211
 212   return set_tty_state (scb, state);
 213 }
 214
 215 static int
 216 hardwire_noflush_set_tty_state (struct serial *scb,
 217                                 serial_ttystate new_ttystate,
 218                                 serial_ttystate old_ttystate)
 219 {
 220   struct hardwire_ttystate new_state;
 221 #ifdef HAVE_SGTTY
 222   struct hardwire_ttystate *state = (struct hardwire_ttystate *) old_ttystate;
 223 #endif
 224
 225   new_state = *(struct hardwire_ttystate *) new_ttystate;
 226
 227   /* Don't change in or out of raw mode; we don't want to flush input.
 228      termio and termios have no such restriction; for them flushing input
 229      is separate from setting the attributes.  */
 230
 231 #ifdef HAVE_SGTTY
 232   if (state->sgttyb.sg_flags & RAW)
 233     new_state.sgttyb.sg_flags |= RAW;
 234   else
 235     new_state.sgttyb.sg_flags &= ~RAW;
 236
 237   /* I'm not sure whether this is necessary; the manpage just mentions
 238      RAW not CBREAK.  */
 239   if (state->sgttyb.sg_flags & CBREAK)
 240     new_state.sgttyb.sg_flags |= CBREAK;
 241   else
 242     new_state.sgttyb.sg_flags &= ~CBREAK;
 243 #endif
 244
 245   return set_tty_state (scb, &new_state);
 246 }
 247
 248 static void
 249 hardwire_print_tty_state (struct serial *scb,
 250                           serial_ttystate ttystate,
 251                           struct ui_file *stream)
 252 {
 253   struct hardwire_ttystate *state = (struct hardwire_ttystate *) ttystate;
 254   int i;
 255
 256 #ifdef HAVE_TERMIOS
 257   fprintf_filtered (stream, "c_iflag = 0x%x, c_oflag = 0x%x,\n",
 258                     (int) state->termios.c_iflag,
 259                     (int) state->termios.c_oflag);
 260   fprintf_filtered (stream, "c_cflag = 0x%x, c_lflag = 0x%x\n",
 261                     (int) state->termios.c_cflag,
 262                     (int) state->termios.c_lflag);
 263 #if 0
 264   /* This not in POSIX, and is not really documented by those systems
 265      which have it (at least not Sun).  */
 266   fprintf_filtered (stream, "c_line = 0x%x.\n", state->termios.c_line);
 267 #endif
 268   fprintf_filtered (stream, "c_cc: ");
 269   for (i = 0; i < NCCS; i += 1)
 270     fprintf_filtered (stream, "0x%x ", state->termios.c_cc[i]);
 271   fprintf_filtered (stream, "\n");
 272 #endif
 273
 274 #ifdef HAVE_TERMIO
 275   fprintf_filtered (stream, "c_iflag = 0x%x, c_oflag = 0x%x,\n",
 276                     state->termio.c_iflag, state->termio.c_oflag);
 277   fprintf_filtered (stream, "c_cflag = 0x%x, c_lflag = 0x%x, c_line = 0x%x.\n",
 278                     state->termio.c_cflag, state->termio.c_lflag,
 279                     state->termio.c_line);
 280   fprintf_filtered (stream, "c_cc: ");
 281   for (i = 0; i < NCC; i += 1)
 282     fprintf_filtered (stream, "0x%x ", state->termio.c_cc[i]);
 283   fprintf_filtered (stream, "\n");
 284 #endif
 285
 286 #ifdef HAVE_SGTTY
 287   fprintf_filtered (stream, "sgttyb.sg_flags = 0x%x.\n",
 288                     state->sgttyb.sg_flags);
 289
 290   fprintf_filtered (stream, "tchars: ");
 291   for (i = 0; i < (int) sizeof (struct tchars); i++)
 292     fprintf_filtered (stream, "0x%x ", ((unsigned char *) &state->tc)[i]);
 293   fprintf_filtered (stream, "\n");
 294
 295   fprintf_filtered (stream, "ltchars: ");
 296   for (i = 0; i < (int) sizeof (struct ltchars); i++)
 297     fprintf_filtered (stream, "0x%x ", ((unsigned char *) &state->ltc)[i]);
 298   fprintf_filtered (stream, "\n");
 299
 300   fprintf_filtered (stream, "lmode:  0x%x\n", state->lmode);
 301 #endif
 302 }
 303
 304 /* Wait for the output to drain away, as opposed to flushing
 305    (discarding) it.  */
 306
 307 static int
 308 hardwire_drain_output (struct serial *scb)
 309 {
 310 #ifdef HAVE_TERMIOS
 311   return tcdrain (scb->fd);
 312 #endif
 313
 314 #ifdef HAVE_TERMIO
 315   return ioctl (scb->fd, TCSBRK, 1);
 316 #endif
 317
 318 #ifdef HAVE_SGTTY
 319   /* Get the current state and then restore it using TIOCSETP,
 320      which should cause the output to drain and pending input
 321      to be discarded.  */
 322   {
 323     struct hardwire_ttystate state;
 324
 325     if (get_tty_state (scb, &state))
 326       {
 327         return (-1);
 328       }
 329     else
 330       {
 331         return (ioctl (scb->fd, TIOCSETP, &state.sgttyb));
 332       }
 333   }
 334 #endif
 335 }
 336
 337 static int
 338 hardwire_flush_output (struct serial *scb)
 339 {
 340 #ifdef HAVE_TERMIOS
 341   return tcflush (scb->fd, TCOFLUSH);
 342 #endif
 343
 344 #ifdef HAVE_TERMIO
 345   return ioctl (scb->fd, TCFLSH, 1);
 346 #endif
 347
 348 #ifdef HAVE_SGTTY
 349   /* This flushes both input and output, but we can't do better.  */
 350   return ioctl (scb->fd, TIOCFLUSH, 0);
 351 #endif
 352 }
 353
 354 static int
 355 hardwire_flush_input (struct serial *scb)
 356 {
 357   ser_base_flush_input (scb);
 358
 359 #ifdef HAVE_TERMIOS
 360   return tcflush (scb->fd, TCIFLUSH);
 361 #endif
 362
 363 #ifdef HAVE_TERMIO
 364   return ioctl (scb->fd, TCFLSH, 0);
 365 #endif
 366
 367 #ifdef HAVE_SGTTY
 368   /* This flushes both input and output, but we can't do better.  */
 369   return ioctl (scb->fd, TIOCFLUSH, 0);
 370 #endif
 371 }
 372
 373 static int
 374 hardwire_send_break (struct serial *scb)
 375 {
 376 #ifdef HAVE_TERMIOS
 377   return tcsendbreak (scb->fd, 0);
 378 #endif
 379
 380 #ifdef HAVE_TERMIO
 381   return ioctl (scb->fd, TCSBRK, 0);
 382 #endif
 383
 384 #ifdef HAVE_SGTTY
 385   {
 386     int status;
 387
 388     status = ioctl (scb->fd, TIOCSBRK, 0);
 389
 390     /* Can't use usleep; it doesn't exist in BSD 4.2.  */
 391     /* Note that if this gdb_select() is interrupted by a signal it will not
 392        wait the full length of time.  I think that is OK.  */
 393     gdb_usleep (250000);
 394     status = ioctl (scb->fd, TIOCCBRK, 0);
 395     return status;
 396   }
 397 #endif
 398 }
 399
 400 static void
 401 hardwire_raw (struct serial *scb)
 402 {
 403   struct hardwire_ttystate state;
 404
 405   if (get_tty_state (scb, &state))
 406     fprintf_unfiltered (gdb_stderr, "get_tty_state failed: %s\n",
 407                         safe_strerror (errno));
 408
 409 #ifdef HAVE_TERMIOS
 410   state.termios.c_iflag = 0;
 411   state.termios.c_oflag = 0;
 412   state.termios.c_lflag = 0;
 413   state.termios.c_cflag &= ~CSIZE;
 414   state.termios.c_cflag |= CLOCAL | CS8;
 415 #ifdef CRTSCTS
 416   /* h/w flow control.  */
 417   if (serial_hwflow)
 418     state.termios.c_cflag |= CRTSCTS;
 419   else
 420     state.termios.c_cflag &= ~CRTSCTS;
 421 #ifdef CRTS_IFLOW
 422   if (serial_hwflow)
 423     state.termios.c_cflag |= CRTS_IFLOW;
 424   else
 425     state.termios.c_cflag &= ~CRTS_IFLOW;
 426 #endif
 427 #endif
 428   state.termios.c_cc[VMIN] = 0;
 429   state.termios.c_cc[VTIME] = 0;
 430 #endif
 431
 432 #ifdef HAVE_TERMIO
 433   state.termio.c_iflag = 0;
 434   state.termio.c_oflag = 0;
 435   state.termio.c_lflag = 0;
 436   state.termio.c_cflag &= ~CSIZE;
 437   state.termio.c_cflag |= CLOCAL | CS8;
 438   state.termio.c_cc[VMIN] = 0;
 439   state.termio.c_cc[VTIME] = 0;
 440 #endif
 441
 442 #ifdef HAVE_SGTTY
 443   state.sgttyb.sg_flags |= RAW | ANYP;
 444   state.sgttyb.sg_flags &= ~(CBREAK | ECHO);
 445 #endif
 446
 447   scb->current_timeout = 0;
 448
 449   if (set_tty_state (scb, &state))
 450     fprintf_unfiltered (gdb_stderr, "set_tty_state failed: %s\n",
 451                         safe_strerror (errno));
 452 }
 453
 454 /* Wait for input on scb, with timeout seconds.  Returns 0 on success,
 455    otherwise SERIAL_TIMEOUT or SERIAL_ERROR.
 456
 457    For termio{s}, we actually just setup VTIME if necessary, and let the
 458    timeout occur in the read() in hardwire_read().  */
 459
 460 /* FIXME: cagney/1999-09-16: Don't replace this with the equivalent
 461    ser_base*() until the old TERMIOS/SGTTY/... timer code has been
 462    flushed. .  */
 463
 464 /* NOTE: cagney/1999-09-30: Much of the code below is dead.  The only
 465    possible values of the TIMEOUT parameter are ONE and ZERO.
 466    Consequently all the code that tries to handle the possability of
 467    an overflowed timer is unnecessary.  */
 468
 469 static int
 470 wait_for (struct serial *scb, int timeout)
 471 {
 472 #ifdef HAVE_SGTTY
 473   while (1)
 474     {
 475       struct timeval tv;
 476       fd_set readfds;
 477       int numfds;
 478
 479       /* NOTE: Some OS's can scramble the READFDS when the select()
 480          call fails (ex the kernel with Red Hat 5.2).  Initialize all
 481          arguments before each call.  */
 482
 483       tv.tv_sec = timeout;
 484       tv.tv_usec = 0;
 485
 486       FD_ZERO (&readfds);
 487       FD_SET (scb->fd, &readfds);
 488
 489       if (timeout >= 0)
 490         numfds = gdb_select (scb->fd + 1, &readfds, 0, 0, &tv);
 491       else
 492         numfds = gdb_select (scb->fd + 1, &readfds, 0, 0, 0);
 493
 494       if (numfds <= 0)
 495         if (numfds == 0)
 496           return SERIAL_TIMEOUT;
 497         else if (errno == EINTR)
 498           continue;
 499         else
 500           return SERIAL_ERROR;  /* Got an error from select or poll.  */
 501
 502       return 0;
 503     }
 504 #endif /* HAVE_SGTTY */
 505
 506 #if defined HAVE_TERMIO || defined HAVE_TERMIOS
 507   if (timeout == scb->current_timeout)
 508     return 0;
 509
 510   scb->current_timeout = timeout;
 511
 512   {
 513     struct hardwire_ttystate state;
 514
 515     if (get_tty_state (scb, &state))
 516       fprintf_unfiltered (gdb_stderr, "get_tty_state failed: %s\n",
 517                           safe_strerror (errno));
 518
 519 #ifdef HAVE_TERMIOS
 520     if (timeout < 0)
 521       {
 522         /* No timeout.  */
 523         state.termios.c_cc[VTIME] = 0;
 524         state.termios.c_cc[VMIN] = 1;
 525       }
 526     else
 527       {
 528         state.termios.c_cc[VMIN] = 0;
 529         state.termios.c_cc[VTIME] = timeout * 10;
 530         if (state.termios.c_cc[VTIME] != timeout * 10)
 531           {
 532
 533             /* If c_cc is an 8-bit signed character, we can't go
 534                bigger than this.  If it is always unsigned, we could use
 535                25.  */
 536
 537             scb->current_timeout = 12;
 538             state.termios.c_cc[VTIME] = scb->current_timeout * 10;
 539             scb->timeout_remaining = timeout - scb->current_timeout;
 540           }
 541       }
 542 #endif
 543
 544 #ifdef HAVE_TERMIO
 545     if (timeout < 0)
 546       {
 547         /* No timeout.  */
 548         state.termio.c_cc[VTIME] = 0;
 549         state.termio.c_cc[VMIN] = 1;
 550       }
 551     else
 552       {
 553         state.termio.c_cc[VMIN] = 0;
 554         state.termio.c_cc[VTIME] = timeout * 10;
 555         if (state.termio.c_cc[VTIME] != timeout * 10)
 556           {
 557             /* If c_cc is an 8-bit signed character, we can't go
 558                bigger than this.  If it is always unsigned, we could use
 559                25.  */
 560
 561             scb->current_timeout = 12;
 562             state.termio.c_cc[VTIME] = scb->current_timeout * 10;
 563             scb->timeout_remaining = timeout - scb->current_timeout;
 564           }
 565       }
 566 #endif
 567
 568     if (set_tty_state (scb, &state))
 569       fprintf_unfiltered (gdb_stderr, "set_tty_state failed: %s\n",
 570                           safe_strerror (errno));
 571
 572     return 0;
 573   }
 574 #endif /* HAVE_TERMIO || HAVE_TERMIOS */
 575 }
 576
 577 /* Read a character with user-specified timeout.  TIMEOUT is number of
 578    seconds to wait, or -1 to wait forever.  Use timeout of 0 to effect
 579    a poll.  Returns char if successful.  Returns SERIAL_TIMEOUT if
 580    timeout expired, EOF if line dropped dead, or SERIAL_ERROR for any
 581    other error (see errno in that case).  */
 582
 583 /* FIXME: cagney/1999-09-16: Don't replace this with the equivalent
 584    ser_base*() until the old TERMIOS/SGTTY/... timer code has been
 585    flushed.  */
 586
 587 /* NOTE: cagney/1999-09-16: This function is not identical to
 588    ser_base_readchar() as part of replacing it with ser_base*()
 589    merging will be required - this code handles the case where read()
 590    times out due to no data while ser_base_readchar() doesn't expect
 591    that.  */
 592
 593 static int
 594 do_hardwire_readchar (struct serial *scb, int timeout)
 595 {
 596   int status, delta;
 597   int detach = 0;
 598
 599   if (timeout > 0)
 600     timeout++;
 601
 602   /* We have to be able to keep the GUI alive here, so we break the
 603      original timeout into steps of 1 second, running the "keep the
 604      GUI alive" hook each time through the loop.
 605
 606      Also, timeout = 0 means to poll, so we just set the delta to 0,
 607      so we will only go through the loop once.  */
 608
 609   delta = (timeout == 0 ? 0 : 1);
 610   while (1)
 611     {
 612
 613       /* N.B. The UI may destroy our world (for instance by calling
 614          remote_stop,) in which case we want to get out of here as
 615          quickly as possible.  It is not safe to touch scb, since
 616          someone else might have freed it.  The
 617          deprecated_ui_loop_hook signals that we should exit by
 618          returning 1.  */
 619
 620       if (deprecated_ui_loop_hook)
 621         detach = deprecated_ui_loop_hook (0);
 622
 623       if (detach)
 624         return SERIAL_TIMEOUT;
 625
 626       scb->timeout_remaining = (timeout < 0 ? timeout : timeout - delta);
 627       status = wait_for (scb, delta);
 628
 629       if (status < 0)
 630         return status;
 631
 632       status = read (scb->fd, scb->buf, BUFSIZ);
 633
 634       if (status <= 0)
 635         {
 636           if (status == 0)
 637             {
 638               /* Zero characters means timeout (it could also be EOF, but
 639                  we don't (yet at least) distinguish).  */
 640               if (scb->timeout_remaining > 0)
 641                 {
 642                   timeout = scb->timeout_remaining;
 643                   continue;
 644                 }
 645               else if (scb->timeout_remaining < 0)
 646                 continue;
 647               else
 648                 return SERIAL_TIMEOUT;
 649             }
 650           else if (errno == EINTR)
 651             continue;
 652           else
 653             return SERIAL_ERROR;        /* Got an error from read.  */
 654         }
 655
 656       scb->bufcnt = status;
 657       scb->bufcnt--;
 658       scb->bufp = scb->buf;
 659       return *scb->bufp++;
 660     }
 661 }
 662
 663 static int
 664 hardwire_readchar (struct serial *scb, int timeout)
 665 {
 666   return generic_readchar (scb, timeout, do_hardwire_readchar);
 667 }
 668
 669
 670 #ifndef B19200
 671 #define B19200 EXTA
 672 #endif
 673
 674 #ifndef B38400
 675 #define B38400 EXTB
 676 #endif
 677
 678 /* Translate baud rates from integers to damn B_codes.  Unix should
 679    have outgrown this crap years ago, but even POSIX wouldn't buck it.  */
 680
 681 static struct
 682 {
 683   int rate;
 684   int code;
 685 }
 686 baudtab[] =
 687 {
 688   {
 689     50, B50
 690   }
 691   ,
 692   {
 693     75, B75
 694   }
 695   ,
 696   {
 697     110, B110
 698   }
 699   ,
 700   {
 701     134, B134
 702   }
 703   ,
 704   {
 705     150, B150
 706   }
 707   ,
 708   {
 709     200, B200
 710   }
 711   ,
 712   {
 713     300, B300
 714   }
 715   ,
 716   {
 717     600, B600
 718   }
 719   ,
 720   {
 721     1200, B1200
 722   }
 723   ,
 724   {
 725     1800, B1800
 726   }
 727   ,
 728   {
 729     2400, B2400
 730   }
 731   ,
 732   {
 733     4800, B4800
 734   }
 735   ,
 736   {
 737     9600, B9600
 738   }
 739   ,
 740   {
 741     19200, B19200
 742   }
 743   ,
 744   {
 745     38400, B38400
 746   }
 747   ,
 748 #ifdef B57600
 749   {
 750     57600, B57600
 751   }
 752   ,
 753 #endif
 754 #ifdef B115200
 755   {
 756     115200, B115200
 757   }
 758   ,
 759 #endif
 760 #ifdef B230400
 761   {
 762     230400, B230400
 763   }
 764   ,
 765 #endif
 766 #ifdef B460800
 767   {
 768     460800, B460800
 769   }
 770   ,
 771 #endif
 772   {
 773     -1, -1
 774   }
 775   ,
 776 };
 777
 778 static int
 779 rate_to_code (int rate)
 780 {
 781   int i;
 782
 783   for (i = 0; baudtab[i].rate != -1; i++)
 784     {
 785       /* test for perfect macth.  */
 786       if (rate == baudtab[i].rate)
 787         return baudtab[i].code;
 788       else
 789         {
 790           /* check if it is in between valid values.  */
 791           if (rate < baudtab[i].rate)
 792             {
 793               if (i)
 794                 {
 795                   warning (_("Invalid baud rate %d.  "
 796                              "Closest values are %d and %d."),
 797                            rate, baudtab[i - 1].rate, baudtab[i].rate);
 798                 }
 799               else
 800                 {
 801                   warning (_("Invalid baud rate %d.  Minimum value is %d."),
 802                            rate, baudtab[0].rate);
 803                 }
 804               return -1;
 805             }
 806         }
 807     }
 808
 809   /* The requested speed was too large.  */
 810   warning (_("Invalid baud rate %d.  Maximum value is %d."),
 811             rate, baudtab[i - 1].rate);
 812   return -1;
 813 }
 814
 815 static int
 816 hardwire_setbaudrate (struct serial *scb, int rate)
 817 {
 818   struct hardwire_ttystate state;
 819   int baud_code = rate_to_code (rate);
 820
 821   if (baud_code < 0)
 822     {
 823       /* The baud rate was not valid.
 824          A warning has already been issued.  */
 825       errno = EINVAL;
 826       return -1;
 827     }
 828
 829   if (get_tty_state (scb, &state))
 830     return -1;
 831
 832 #ifdef HAVE_TERMIOS
 833   cfsetospeed (&state.termios, baud_code);
 834   cfsetispeed (&state.termios, baud_code);
 835 #endif
 836
 837 #ifdef HAVE_TERMIO
 838 #ifndef CIBAUD
 839 #define CIBAUD CBAUD
 840 #endif
 841
 842   state.termio.c_cflag &= ~(CBAUD | CIBAUD);
 843   state.termio.c_cflag |= baud_code;
 844 #endif
 845
 846 #ifdef HAVE_SGTTY
 847   state.sgttyb.sg_ispeed = baud_code;
 848   state.sgttyb.sg_ospeed = baud_code;
 849 #endif
 850
 851   return set_tty_state (scb, &state);
 852 }
 853
 854 static int
 855 hardwire_setstopbits (struct serial *scb, int num)
 856 {
 857   struct hardwire_ttystate state;
 858   int newbit;
 859
 860   if (get_tty_state (scb, &state))
 861     return -1;
 862
 863   switch (num)
 864     {
 865     case SERIAL_1_STOPBITS:
 866       newbit = 0;
 867       break;
 868     case SERIAL_1_AND_A_HALF_STOPBITS:
 869     case SERIAL_2_STOPBITS:
 870       newbit = 1;
 871       break;
 872     default:
 873       return 1;
 874     }
 875
 876 #ifdef HAVE_TERMIOS
 877   if (!newbit)
 878     state.termios.c_cflag &= ~CSTOPB;
 879   else
 880     state.termios.c_cflag |= CSTOPB;    /* two bits */
 881 #endif
 882
 883 #ifdef HAVE_TERMIO
 884   if (!newbit)
 885     state.termio.c_cflag &= ~CSTOPB;
 886   else
 887     state.termio.c_cflag |= CSTOPB;     /* two bits */
 888 #endif
 889
 890 #ifdef HAVE_SGTTY
 891   return 0;                     /* sgtty doesn't support this */
 892 #endif
 893
 894   return set_tty_state (scb, &state);
 895 }
 896
 897 /* Implement the "setparity" serial_ops callback.  */
 898
 899 static int
 900 hardwire_setparity (struct serial *scb, int parity)
 901 {
 902   struct hardwire_ttystate state;
 903   int newparity = 0;
 904
 905   if (get_tty_state (scb, &state))
 906     return -1;
 907
 908   switch (parity)
 909     {
 910     case GDBPARITY_NONE:
 911       newparity = 0;
 912       break;
 913     case GDBPARITY_ODD:
 914       newparity = PARENB | PARODD;
 915       break;
 916     case GDBPARITY_EVEN:
 917       newparity = PARENB;
 918       break;
 919     default:
 920       internal_warning (__FILE__, __LINE__,
 921                   "Incorrect parity value: %d", parity);
 922       return -1;
 923     }
 924
 925 #ifdef HAVE_TERMIOS
 926   state.termios.c_cflag &= ~(PARENB | PARODD);
 927   state.termios.c_cflag |= newparity;
 928 #endif
 929
 930 #ifdef HAVE_TERMIO
 931   state.termio.c_cflag &= ~(PARENB | PARODD);
 932   state.termio.c_cflag |= newparity;
 933 #endif
 934
 935 #ifdef HAVE_SGTTY
 936   return 0;            /* sgtty doesn't support this */
 937 #endif
 938   return set_tty_state (scb, &state);
 939 }
 940
 941
 942 static void
 943 hardwire_close (struct serial *scb)
 944 {
 945   if (scb->fd < 0)
 946     return;
 947
 948   close (scb->fd);
 949   scb->fd = -1;
 950 }
 951 \f
 952 \f
 953
 954 /* The hardwire ops.  */
 955
 956 static const struct serial_ops hardwire_ops =
 957 {
 958   "hardwire",
 959   hardwire_open,
 960   hardwire_close,
 961   NULL,
 962   /* FIXME: Don't replace this with the equivalent ser_base*() until
 963      the old TERMIOS/SGTTY/... timer code has been flushed.  cagney
 964      1999-09-16.  */
 965   hardwire_readchar,
 966   ser_base_write,
 967   hardwire_flush_output,
 968   hardwire_flush_input,
 969   hardwire_send_break,
 970   hardwire_raw,
 971   hardwire_get_tty_state,
 972   hardwire_copy_tty_state,
 973   hardwire_set_tty_state,
 974   hardwire_print_tty_state,
 975   hardwire_noflush_set_tty_state,
 976   hardwire_setbaudrate,
 977   hardwire_setstopbits,
 978   hardwire_setparity,
 979   hardwire_drain_output,
 980   ser_base_async,
 981   ser_unix_read_prim,
 982   ser_unix_write_prim
 983 };
 984
 985 void
 986 _initialize_ser_hardwire (void)
 987 {
 988   serial_add_interface (&hardwire_ops);
 989
 990 #ifdef HAVE_TERMIOS
 991 #ifdef CRTSCTS
 992   add_setshow_boolean_cmd ("remoteflow", no_class,
 993                            &serial_hwflow, _("\
 994 Set use of hardware flow control for remote serial I/O."), _("\
 995 Show use of hardware flow control for remote serial I/O."), _("\
 996 Enable or disable hardware flow control (RTS/CTS) on the serial port\n\
 997 when debugging using remote targets."),
 998                            NULL,
 999                            show_serial_hwflow,
1000                            &setlist, &showlist);
1001 #endif
1002 #endif
1003 }
1004
1005 int
1006 ser_unix_read_prim (struct serial *scb, size_t count)
1007 {
1008   int status;
1009
1010   while (1)
1011     {
1012       status = read (scb->fd, scb->buf, count);
1013       if (status != -1 || errno != EINTR)
1014         break;
1015     }
1016   return status;
1017 }
1018
1019 int
1020 ser_unix_write_prim (struct serial *scb, const void *buf, size_t len)
1021 {
1022   /* ??? Historically, GDB has not retried calls to "write" that
1023      result in EINTR.  */
1024   return write (scb->fd, buf, len);
1025 }